Witch Wars and Second Campaigns

Again, no gaming for me this weekend. So when I am not working on my current 5e game my mind tends to wander a bit. Lately, I have been thinking a lot about what needs to be done next.

A brief recap though.

I started playing with my kids when my son turned 5, so about 2005 or so.
That adventure was the start of what would become the Dragonslayers campaign. There was no over arching plot and we made a lot up as we went along. The rule system was a modified version of D&D 3.0 with bits of Mutants & Masterminds, BESM d20 and Star Wars thrown in for good measure. Soon my youngest son joined and there was a rotating cast of characters (sometimes joined by their friends) under the vague notion of stopping the threat of evil dragons. Eventually the party decided that they had to stop Tiamat herself. We went through many of the classic adventures and a lot that were completely made up on the day of gaming.

When D&D 4 came out we tried a couple of times to get a game going under that but to no real success. Though those failures lead to what we called the Order of the Platinum Dragon games, or what I have been calling here the Come Endless Darkness game. Like every time I have changed rule systems I usually use the children of the characters I was playing before. This time, we started using AD&D 1st Edition. We played that for a couple of levels, notably for adventures B1 and B2. When D&D 5th Ed came out we switch wholesale over to that with flashbacks using AD&D1 and D&D Basic.

Now I want to try something a little different.

The Second Campaign is (in theory) supposed to run in parallel to the Come Endless Darkness game. Different characters, but the same world and time. One of the elements of this game is that one of the characters that went missing from the CED game will show up here. That game is limited to only 12-14 levels, then for the big finale all the characters would come together in the end. BUT...that might not work so well since I didn't get the Second Campaign started when I should have. Or rather, the CED game had too much momentum and we kept going. In the CED game they are going to deal with the Lolth-Orcus threat, in TSC it will be Dagon and Demongorgon.
Since it is a "Second Campaign" I want to follow the model of the "First Campaign" or Come Endless Darkness and use classic modules. These are the ones I am considering.

N1 Against the Cult of the Reptile God, levels 1-3 (novice)
U1 The Sinister Secret of Saltmarsh, levels 1-3
U2 Danger at Dunwater, levels 1-4
U3 The Final Enemy, levels 3-5
I1 Dwellers of the Forbidden City, levels 4-7
I3 Pharaoh, levels 5-7
I4 Oasis of the White Palm, levels 6-8
I5 Lost Tomb of Martek, levels 7-9
X4 Master of the Desert Nomads, levels 6-9
X5 Temple of Death, levels 6-10
I9 Day of Al'Akbar, level 8-10
Gary Gygax's Necropolis, levels 10+

The only one that I am 100% sold on is Necropolis.

Since these are all AD&D modules (save Necropolis) I might stick to AD&D, but it is far more likely that this will be a combination of Basic/Expert D&D, Astonishing Swordsmen & Sorcerers of Hyperborea, Adventurer Conqueror King, Basic Fantasy RPG, Labyrinth Lord and any other OSR book I have laying around. It is a mix-mash that I often refer to as "Black Box Basic".

The trouble it that it make much more sense for this game to use Castles & Crusades. Converting between C&C and D&D5 is a no brainer really. Super easy. I want to play C&C. I also want to play Black Box.

The only ones I don't have PDFs for.

The campaign after this will be my War of the Witch Queens.
That one will be run under Castles & Crusades and also use a variety of adventures.

The Stealer of Children (LL), level 1
B7 Rahasia (Basic D&D), levels 1-3
The Ruins of Ramat (S&W), levels 1-3
Return of the Warlock (S&W), levels 2-4
The Manor Issue 6 (OSR), low level (roughly 3rd)
Witch of the Tarriswoods (OSR), 3rd level
Saga of the Witch Queen (DCC), 4th level
A3 Wicked Cauldron (C&C), levels 3-5
Night of the Spirits (C&C), levels 4-6
No Salvation for Witches (LotFP), not mentioned, likely levels 5-7
Witches Court Marshes (AD&D_ish), around 7
Fane of the Witch King (3.0/d20), levels 10+
Dark Druids, AD&D1/OSRIC, levels 8-12
The Dancing Hut of Baba Yaga (AD&D_2e), levels 7-20
The Witch Queen's Revenge (Pathfinder), levels 15+
The Witchwar Legacy (Pathfinder), levels 17+
Winter of the Witch (D&D4), Epic levels

One campaign has a variety of rules, but adventures that are for the same system. The other uses one set of rules, but each adventure is for a different system.

One day I'll do something easy.